That zoom is plus .25 to minus .25 inch focal length. If on a 2 inch lens range would be 1.75 to 2.25.
Larry Urbanski Film On Thu, Apr 21, 2016 at 7:18 PM, Steve Polta <steve.po...@gmail.com> wrote: > Dear Gearheads, > > San Francisco Cinematheque is in possession of a zoom lens > attachment—specifically a Buhl 16mm "Varazoom," Cat. No. 833-490. You can > see one just like it here > <http://www.terapeak.com/worth/new-buhl-833-490-f1-2-50mm-varazoom-for-viewlex-audio-video-2-projection-lens/400989585437/> > and here > <http://www.ebay.ca/sch/sis.html?_nkw=New%20Buhl%20833%20490%20f1%202%2050mm%20Varazoom%20Viewlex%20Audio%20Video%202%20Projection%20Lens&_itemId=181284448888>. > I know it says "video" on those pages but we use it for 16mm (I also > realize that those two pages might be somehow clones of each other.) > > The device is screwed on to a 50mm fixed lens and is obviously intended to > add zoomable variance to this fixed lens. And indeed it does—you can see it > "zooming." > > The question: can anyone tell me what the effective focal length(s) of > this combo provides. I'd like to be able to communicate this info to > someone but cannot find this information anywhere. > > Thanks for any useful feedback that can be provided. > > Steve Polta > > _______________________________________________ > FrameWorks mailing list > FrameWorks@jonasmekasfilms.com > https://mailman-mail5.webfaction.com/listinfo/frameworks > >
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